Every appliance and office equipment that runs on electrical current produces low frequency electromagnetic fields. For example, the fly-back transformer (which controls electron beams to produce the image on our screen) in our computer monitor produces "very low frequency" (VLF) electromagnetic radiation. On the other hand, computer CPU emits "extremely low frequency" (ELF) electromagnetic fields.

Scientists have long known that exposure to ionizing radiation (high frequency electromagnetic energy) like that associated with X-rays and gamma rays can cause cancer. However, there are still debates about the long-term effects of the lower frequency, less powerful radiation associated with appliances like computers, microwave ovens and television sets.

More epidemiological and laboratory research is now under way. It may take a decade or more, however, for scientists to determine whether the electromagnetic fields produced by appliances can pose real health problems.

Meanwhile, scientists and public health workers suggest that the prudent response to the current scientific uncertainty is to reduce exposure as much as possible.

According to proximity, common home appliances have the following radiation level: